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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae55211e79b50e700f0e092c185d3d3d9036eb2e57c063cc09325b022a042c4e' 
  AND token = 'v0tmJFXcV0/f8AMmxJRIPSjHnWZ9DFvgqfnGwAjqGzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}